# -*- mode: snippet -*-
# name: boxed equations
# key: box
# group: environments
# expand-env: ((yas-indent-line 'fixed))
# --
\begin{equation*}
  \setlength\fboxsep{0.2cm}
  \setlength\fboxrule{0.4pt}
  \boxed{$0}
\end{equation*}